Examine source code of Travel11

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#75ccff",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Travel11",
  "manifest_version": 2,
  "description": "A minimalistic / abstract persona based on the wallpaper pack \"Travel11\" by petercui: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/74e8abccc348cf1bc6559f1adef8b9bd328b130badeb489e7f91592b950ccbbf/http%3A//petercui.deviantart.com/art/Travel11-77606529\">http://petercui.deviantart.com/art/Travel11-77606529</a>\n\nAll credit goes to him, I only resized the main central swirl and adapted the background."
}